Etymology
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directly (adv.)

late 14c., "completely;" early 15c., "in a straight line," also, figuratively (of speaking or writing) "clearly, unmistakably, expressly," from direct (adj.) + -ly (2). Meaning "at once, straightway, immediately in time" (c. 1600) is from earlier sense of "without intermediate steps" (1520s).

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Definitions of directly

directly (adv.)
without anyone or anything intervening;
he was directly responsible
these two factors are directly related
measured the physical properties directly
directly (adv.)
without deviation;
the path leads directly to the lake
Synonyms: straight / direct
directly (adv.)
without delay or hesitation; with no time intervening;
Synonyms: immediately / instantly / straightaway / straight off / now / right away / at once / forthwith / like a shot
directly (adv.)
in a forthright manner; candidly or frankly;
he didn't answer directly
Synonyms: flat / straight
From wordnet.princeton.edu